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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a3fe09bfa8b58ba71dd52c95a4b190942ff84e82391719f9f8ef4155d20862' 
  AND token = 'JWuLMWDzOvzm7PEIR7h9t93IG+tfxkpWLKl2XHNa/bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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