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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ff5d16c0fab5b8b1e0133786751b25e77b0716e2165e179ccd06556851a4fd' 
  AND token = 'fbiJ6xuz3yfLtmGkb7ygN7xxbZJQiQVGP7R6ka1ERVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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