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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7619b33ae1ea36874897d18f9b783d2ff2eff5baf6ea778d5c7e8046414e1c3f' 
  AND token = 'fFNfSobnnsXSc3hIoIc6vnDcJGZe17DGaNA1VEdROjA=' 
  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"
    }
  }
}