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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbeb6bd77288df280142c1ae32678714a5e2146239e8547a388a51270ea36dc' 
  AND token = 'T/xbavIrYjeEDd8gjW86AQ/Hq+s979RjTh0J/hUPN9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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