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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2993e5825ccef6e8448d494fffd28c238de2da1f7645455f43ffd16bb1f10939' 
  AND token = 'Kx11yegbOOw/4cujr+H4Pn5mHtyZw6K5hW+9+C9H4ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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