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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15ba9f8a3502d79540847f7924f0fe9af9bc75078798bda09942f694f5ef400' 
  AND token = 'dj08CJ8RwvX5VCHyg+jdNnYdgo/t9QJtu57UgMYHcvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}