SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008659c2d394bc529fa94ff9ae977d46172e26e5d5aaa0b02e5a28cfe6f9e783' 
  AND token = 'DwwkyOPgwHQz8PznGRzFDm+SbZUeHm3YG3/25sLfjt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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