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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c5e59fb16fb34017922df0b2b038574a59edc986a61603fdd4bea542109e41' 
  AND token = '6751eYBYXqKrFxp9x1pgCq84bPce8nyxo2fty4OeLnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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