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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c463c99041ecaa0b6b45754d84cba0ea3cd618fa7762f87010bea756fd52d69' 
  AND token = 'D/Zf4ca+taamgc5M6VjqxlJEAz/EmaGWP9N43ui5/2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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