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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42f3452d79b15335fdba7fdea57d656bfb3b90698ef25e18ebef8b15e89c6de' 
  AND token = 'Cz3utQ6P47AfQyIm+viePjlhMJ0WindzC/p87TdeNHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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