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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dceb62fff753d8dcef0a7d50b6f0fc471d7b99212c716c7a4752422df3512c6' 
  AND token = '7aLCI+2vopN23fiUxX4iZDzpS1rncafpEEVq0or3JMU=' 
  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"
    }
  }
}