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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b484ec70a733e2689651b6837fb76f5da71412c7ce44b029a5a2f27e34e370d4' 
  AND token = 'YsNhvwzxbfIQJ/69b0JTIkH8aGiJeZ8jMTklrkdFw0o=' 
  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"
    }
  }
}