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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2016a8df67531671c9856dddaacd2be29c956368112cd197da76834a419959' 
  AND token = 'kmibIEpD7iseJCRtw96BHmUOfwQbGo6RjheCz/zRgRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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