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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ce8fc37db0cc6078d72492d8d24fab6178359a55b98e2dde6cde269a62f9fd' 
  AND token = 'tAii8ei4hxPz03tbTfUQJ7h/gc+EAKuKEFw/5KI2cIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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