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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30110cce222f15f41405f2c9db40b5a90d0fe24be9c2f17ab0fbcf8bfac8977d' 
  AND token = 'wqs9Ga0zIet3pahwxw8qPdvnx5Qi/Z1MnfFoeXQCG00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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