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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732dfb69e66c7adc6f214203109d3c2820c4e95ebce4fa69b879ebdbfe0be91a' 
  AND token = 'A6KPvHWo7RG4x0HqBYxAzPIPKaLDkGswBQ3xbPNeZnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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