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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f7108fc29f83a1413b9816f9fd9c46f9a005d40970a95cb4bb65da6f724cae' 
  AND token = 'tjTiS2vi2SHn0fxyRle7DF2Wqkfoz/CNJjU8KTtdB4I=' 
  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"
    }
  }
}