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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b8dcf478c78716613b622bab1f2fbe1d45afdf15147adb52b6b569c7851d94' 
  AND token = 'Sh5u4fkLUF86TDveNjmgTa0CdDRJOdvFnyR9CrgWHOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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