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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af49b6571b5108bc9d37edf5d1020dd9b508e287e2f3b39f0f3c37b31a152815' 
  AND token = 'u46WLZBaiU/ENwqITS4Tk4ZzzH3CyXro8t5Urq8fE9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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