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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03ae2ca1a0cd879e1e7f4cda66d8080107a4b15811e8df8c41131938aeba6dc' 
  AND token = 'E9fMvxMuP5O0eS54ILzYK61aEBqAUi85/vRbOEbzkkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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