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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d73e8e03b90caeb9f89d216234022d18b11a1bc7139477c3c0e6742ef063d5' 
  AND token = 'LANNZe+ULE8GAuWkCQTZED+2QjKuYD2GfVcZ+U3RqXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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