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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d0124e50edb28e1f4d05a9fd220176833d74ce85d903392b43cbf2fd81334e' 
  AND token = 'XCC7h2JpVGijb9J81bg5EV4jFWJ+3+/FiJ9fW55NfcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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