SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3be918ce2787d3df82d25dbd6730d1cf17dfc99d23722ceb0ca38c61f764a2' 
  AND token = 'u0vX/K2yYh+55RFphrLkB4uS/lO+Xm6EGuKVSUWBa3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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