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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0966808fa9c5e2085521c62186989883b753ed8a871c2e7e5c97c9d168077d' 
  AND token = 'N4E9MH2wnWecMptFvNMYvUJHk6QJ4jqK0tgrKUDwX7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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