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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6bfc977cd2b5739317583b2dd345a9fcf07528c487c62a01ed9393bce10a0e' 
  AND token = 'KBDnbGmVe5TFAtfhpu2BWwclkU2AB/cKD5NuLZRFsvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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