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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd466b6890470319514f4291f478303927521417ee385518af941a8233d901119' 
  AND token = 'EGnvDjwmT7BU3z+9sCBCdVa+pEkpdLvC+MNB1FUNb3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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