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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de188695a721cf96da19bdb3f3b66283bc055867d49aebe36791a82c5fd2eea2' 
  AND token = 'E64RlNGEY+Yd4orHYIAu0wf06My9xD50TEbFwCKyoMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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