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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee72c20da4dc9f8b88a41a064e3fd9b03a075dbff16c2af328feabf5b2696d4' 
  AND token = 'Q3hluh8yfgUrqbOIUqFE4ihLveg+SfPaogsThw8bl/c=' 
  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"
    }
  }
}