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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9780f9daf4f4b182fe08fa0bb8b71ae36f7943ff98a8e92e467f8067fddb59' 
  AND token = 'rqDhJbY5IDH9bAl7XUSfKjSvHC9euBgddN18kF6vTu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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