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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a54f18de1eb93e3b18e653ddc2d8cef37d8865199264b62606f71f01eb580ee' 
  AND token = 'AoPxfIJokyycq2H7/mCXe3QNu1HzQBMliWh4Jv0ZbmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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