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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d6c13fb180481c4079f1ac677bf7db955d04bd0a7ea89e2361340475e828aa' 
  AND token = 'Sk7NTBQfGHINGyCFjCY2wFsoyz11B5+gwb+hxo2UREk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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