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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd679347c05e744a5fbbffbc70fc79f28a4ba207f164cc6ea9db828a99dfad9e9' 
  AND token = '8JvcdFd5g/qOWq5TQKcNc7s4k0XJx5WT7MZMioM/l5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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