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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5089f4a7157e5b8d2579ed35ec8f22d716f34fe0eabde0ef8cf3f2729ed7727' 
  AND token = 'ZHz9UrH7lqp9A+zgEjWs/Fz9aBqOg5W71k1HCFrZNbQ=' 
  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"
    }
  }
}