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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce6aca24bf2b1e181f30f95df882a29684ee769f57776a75cc9ffdd46c99927' 
  AND token = 'Gk7n1ZOnlmDkQ4ayW9q9kYFIBQxsEDUvkM0xh9mfh9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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