SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aec2aa63e66525c198665e7743648d16d67864c78393c16d7d06b092d3a20ba' 
  AND token = 'JeShkzbOrTTk5/rJUf+7+KodKHCYFV5uHUwtYwGPomw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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