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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112dd4ca5a3379124415b7a1241097f70d71e5bb5ea9892d0f014f671013d4ea' 
  AND token = 'tS+XbThV7RvP4aeg2Y4DyjDK3y42FwiIcW9/b3K7PJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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