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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb80684f2523b9f3129148cb6d9db4e76b94215328db748943dceff324f3184' 
  AND token = 'hJKD4nNHUjxz7kHIgNSihH4dviPyv0SNhra122FVy5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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