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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89256ab26139db38b50346ec43015e292e02afc33f7f92ca493d69b511d7868' 
  AND token = '7Rgd5LuMEZu/h20lN8FLQek87gZGEd66ozh/8A7GOwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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