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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da16e5014dc78d088e5c4789b722ce44a062d30c7fad1148064f2a92f5b74326' 
  AND token = 'Ozss1uXWvGHbUJ6BonsM6D8/IP2SxNnn7B1M2quD7zM=' 
  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"
    }
  }
}