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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4dbed992ee7eed0c60649c0df3c8a65ee42ff4522825e1cac92f98ac3d8e746' 
  AND token = 'S2Yg0lBf6lD55Q0UgN6vUEmvZcgCWWMWUGK8gDCell0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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