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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49dc02bca927e5e290e9cb76e0319d0c1d4a3acf6c354c42fdc817c4f271033d' 
  AND token = 'P7zYQ6QMKpP7tm/EnJEw9t7w7IEEht4qypSjunBeuM8=' 
  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"
    }
  }
}