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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c402e42fadf536e94d643a76428291fb24c055479d74df67902279ab3aff9fe7' 
  AND token = '6rYnPYiMDO4U/YtJ+d7fA6mpZuNu+f4jcFI6e13x2ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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