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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de39b2a5ffda174bc90e7178a8dd2e05615bdbd7b47268aac5d45d117ad8d86d' 
  AND token = 'xlbgW7bkrxKmegqOryXS9Dg4j9e/RGsZq0wzT4WLWx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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