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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0627b7551a012b253c4b6d9d7f127a8bae4af8511d041c432fc25eacb56d664e' 
  AND token = '6VoMKx2AcbNDlx4X7Vgot6qvq6mlNKcZCZ772tpe0KY=' 
  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"
    }
  }
}