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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1915a8e9b1b33a993e95c0442bcd4bf8591c29f031e4d356326dd1a128ec7217' 
  AND token = 'PXTqVbQvx1I6tIlrZOHcyn2lA0oNNrFavXnhBP9T220=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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