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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4aa6a34e5f9b805a2562915eb9b72590fb95f456a72ad6dd60b9994d62e594' 
  AND token = '47NB0nHlxi/hbaj56BYKJexm0kAx/B6KkTTiQeUTA5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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