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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23ee72cef38aff9f99c9b95dd9120bfa19723267d2bd1a9f5cb7b72a81be3fd' 
  AND token = 'QbGvBsva7F3Z2bFvgOlmXEWEkwyVreeST1ZMkpN5jac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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