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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65366bd65a4f9a8bdb31ff45d044853265920c59aee56e8b39478c70c6badfab' 
  AND token = 'IJDipNZizCrncCMw+ir6si+Vuo1Y69r8fY1uKvIEBxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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