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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b623a05f0e00c67261749e1ef32329ba0c5319d27df5a68267698bedcf2e6d3e' 
  AND token = 'fNtv+BMscv8n7XWySjHu5muNYTz4MgKM5zHuGzI1AQA=' 
  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"
    }
  }
}