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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8b976572054df696fbc379ff3490cb13b93a53c31cad64d4331bfb9ba89509' 
  AND token = 'NQWPpl08SZxzIlok2y2QgEX5VWoZxr3o+g9AJ3bmj6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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