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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd799ae8d1f854f0255448528c93c6e65d23a43049e00a9f51dd88afc03d24b8f' 
  AND token = 'svX7But7Ibt6pqDgBk3x9dG/9Q87izWL+k8nS6H1cJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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