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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e08d6c006c4ab5fb6ed607b60acf9ca62809e7ae39c99908916e64b728546e6' 
  AND token = 'm5UKcKvjvfRp1kBERwcD8hBGeo7nwCZOiB3Gi8i8gYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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