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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9864f33efb194ab4a32d5f8c03fa44eb2796104f0c59f0fea051b8a6cdd2eb44' 
  AND token = 'pSyF9HWw1+yA3HWZX/1tgQmcoKKEjk+29l7IQX6bCvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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