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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b786433a60372feb80144ce71b29fe4a429561db3a9e9475ee4acb167da81b' 
  AND token = 'Hxd6VFWcaoHkx78mvUpe9y6824CYxINIjcyYiFrx38k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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