SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d45ef83ba70664508c1d196d49b33475cdc0f782be2bc7ed3c62898b90cecfe' 
  AND token = 'FhfBMjHZ94A+vIiRzDL/K7oqCIfVi2t3Y4vGT936NDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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