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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04a4c3a8874cc0c3804da4259830289b37aa3332f364d5c4a89cc1dcb1da9d0' 
  AND token = 's3z4n/8R5Y99RkLaXY46ji+BusNZmXH8SJXaIa4eIm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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