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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea25692a4dd68b2291175f88fb5a65d2b199e3973f41c47f5f2bc5e39c224f7d' 
  AND token = 'kYqDIax8og3NS8yD4enL+jc5H4v1FyMT4g1IZoMKb8M=' 
  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"
    }
  }
}