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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a526d087c1f192853072be4ed95ab65d79465af31f3fc338084a020bf2b242' 
  AND token = 'AxFH7KiEcBleSWls8oX7k1W39pZvP//DcSJKtiazTuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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