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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32e7d668bab24ba2a320b762e32b461b0a2195536d9b6ae7b78c7a131018d84' 
  AND token = 'kbKadprmMQgRRjYCuROSEPuRzQh3gfpzZuZJmqQ9zPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00195

JSON explain

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