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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8893d72f8fc6d34141a3d19ea52bbf3f33d9e0589d3ede5e825d46b085b72303' 
  AND token = 'G5gEGi6X5hvZC/xXoTPFfIgkiOeH7MqVt0EM4dP7Ne4=' 
  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"
    }
  }
}