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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a281740f92f58cd46c58e391113644e7840df75c77fe092a34ec04ea1390d8' 
  AND token = '6c56gfLwJwPlrcKByxGodBLmI5OZK3FZ97YKwLKAL1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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