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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b586653154ae4fda53c0faad3bed9d895987cb61dcc02e8c9473f130960ae31d' 
  AND token = 'cZ7w+3y9vwdlhOyFR6b4aJkpAp+WxigwISE5wU4qeaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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